Trane SWT1274 Limit Switch
The Trane SWT1274 Limit Switch (also listed as SWT01274) is a high-precision HVAC safety control designed for furnace high limit protection. As a veteran-grade OEM furnace part, this thermal limit switch is engineered to monitor the supply plenum temperature, providing a critical fail-safe against heat exchanger damage. It operates with a fixed factory setting that opens at 125°F to break the heating circuit and closes at 95°F to allow for an automatic reset once safe thermals are restored. Rated for 120V AC and 5.8 FLA, this component features a single-pole, normally closed (NC) configuration with standard quick-connect terminals for efficient field replacement. Whether you are troubleshooting furnace short cycling or dealing with an open limit error code on a Trane residential furnace or American Standard air handler, this 3-inch insertion length switch ensures the system maintains precise operational boundaries.
Key Benefits- OEM Precision: Genuine replacement limit switch ensures exact opening at 125 degrees and closing at 95 degrees, maintaining original manufacturer specifications.
- Robust Electrical Design: Handles a current rating of 5.8 Amps (34.8 LRA at 120V) for reliable switching under high-demand cycles.
- Critical System Safety: Prevents furnace overheating caused by restricted airflow, dirty filters, or blower motor failure by terminating the burner circuit.
- Broad Compatibility: Direct replacement for several Trane and American Standard models, addressing common 4-flash red light error codes.
- Simplified Installation: Standard 1/2" NPT mounting and quick-connect terminals reduce downtime for professional technicians.
What are the signs of a faulty Trane SWT1274 limit switch?
Common indicators include the indoor blower fan running continuously while the burners fail to ignite, or the furnace shutting down abruptly shortly after the heating cycle begins, often accompanied by an "Open Limit" diagnostic code.
Can I use this switch in a 24V control circuit?
While typically utilized in 120V circuits for Trane applications, this thermal switch is a dry contact component; however, always verify your specific wiring diagram to ensure the 5.8A rating and 125F trip point match the appliance requirements.
Why is my furnace tripping this limit switch repeatedly?
A tripped limit switch is often a symptom of restricted airflow. Check for a clogged air filter, blocked supply registers, or a failing inducer motor that may be causing internal temperatures to exceed the 125°F threshold.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
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Description
The Trane SWT1274 Limit Switch (also listed as SWT01274) is a high-precision HVAC safety control designed for furnace high limit protection. As a veteran-grade OEM furnace part, this thermal limit switch is engineered to monitor the supply plenum temperature, providing a critical fail-safe against heat exchanger damage. It operates with a fixed factory setting that opens at 125°F to break the heating circuit and closes at 95°F to allow for an automatic reset once safe thermals are restored. Rated for 120V AC and 5.8 FLA, this component features a single-pole, normally closed (NC) configuration with standard quick-connect terminals for efficient field replacement. Whether you are troubleshooting furnace short cycling or dealing with an open limit error code on a Trane residential furnace or American Standard air handler, this 3-inch insertion length switch ensures the system maintains precise operational boundaries.
Key Benefits- OEM Precision: Genuine replacement limit switch ensures exact opening at 125 degrees and closing at 95 degrees, maintaining original manufacturer specifications.
- Robust Electrical Design: Handles a current rating of 5.8 Amps (34.8 LRA at 120V) for reliable switching under high-demand cycles.
- Critical System Safety: Prevents furnace overheating caused by restricted airflow, dirty filters, or blower motor failure by terminating the burner circuit.
- Broad Compatibility: Direct replacement for several Trane and American Standard models, addressing common 4-flash red light error codes.
- Simplified Installation: Standard 1/2" NPT mounting and quick-connect terminals reduce downtime for professional technicians.
What are the signs of a faulty Trane SWT1274 limit switch?
Common indicators include the indoor blower fan running continuously while the burners fail to ignite, or the furnace shutting down abruptly shortly after the heating cycle begins, often accompanied by an "Open Limit" diagnostic code.
Can I use this switch in a 24V control circuit?
While typically utilized in 120V circuits for Trane applications, this thermal switch is a dry contact component; however, always verify your specific wiring diagram to ensure the 5.8A rating and 125F trip point match the appliance requirements.
Why is my furnace tripping this limit switch repeatedly?
A tripped limit switch is often a symptom of restricted airflow. Check for a clogged air filter, blocked supply registers, or a failing inducer motor that may be causing internal temperatures to exceed the 125°F threshold.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
